Hello gents. I've been trying to search but I've been working a month straight on the road. I went to crank up the port engine and noticed some anti freeze on the head. I mopped it up and fired it up. Not to long, 20 seconds I noticed the oil that was bleeding out of the rocker arms (I had the valve cover off) started to turn a little milky. I shut it down right away and I think that I have a leaking valve guide. This motor was closest to the fire when she burned. The antifreeze was bubbling up around the valve. I called the local detroit shop and they said it would be about $1600 or $1800 for a remanned head. Should I try to replace the guides myself? I'll pull the head but I hate to spend the money if the heads not cracked. I don't know if getting hot would cause the guides to get hard but I'm sure the rest of the head is fine. Thanks Paul